Collision analysis of top tensioned riser

• Main Author: Lim, Chee Kean.
• Other Authors: Low Ying Min
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Civil engineering::Structures and design
• Online Access: http://hdl.handle.net/10356/45415
• Institution: Nanyang Technological University

The risk of collision increases as the oil and gas industry is moving to ever deeper water. The riser interaction has become an issue of considerable concern. Riser spacing and top tension requirement are the two parameters to avoid riser collision. Increasing riser spacing affects the deck space and load carrying capacity while a closer riser spacing will increase the risk of mutual contact. Hence, in this project, sensitivity studies on the contact velocity and clashing energy along the riser during collision were carried out, for different riser spacing.A riser system model comprises two risers in a tandem arrangement is developed by considering hydrodynamic interaction. The riser spacing is close enough such that hydrodynamic effects due to the wake shed by another riser lead to clashing between the two risers. An optimum range of riser spacing is chosen to facilitate the sensitivity analysis.